Hello,
An ArrayList can support multiple readers concurrently, as long as the
collection is not modified. To guarantee the thread safety of the
ArrayList, all operations must be done through the wrapper returned by the
Synchronized method.
Enumerating through a collection is intrinsically not a thread-safe
procedure. Even when a collection is synchronized, other threads can still
modify the collection, which causes the enumerator to throw an exception.
To guarantee thread safety during enumeration, you can either lock the
collection during the entire enumeration or catch the exceptions resulting
from changes made by other threads.
Sincerely,
Luke Zhang
Microsoft Online Community Support
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